Electric burglar-alarm.



T. W. KBBNLEYSIDE.

ELECTRIC BURGLAR ALARM.

APPLICATION FILED APB.15, 1912.

1,039, 142, Patented Sept. 24, 1912.

LOLUMBIA PLANOGRAPH c0., WASHINGTON D. c.

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UNITED STATES PATENT OFFICE.

THOMAS WILLIAM KEENLEYSIDE, 0F BISBEE, ARIZONA.

ELECTRIC BURGLAR-ALARM.

To all whom it may concern Be it known that I, THOMAS W. KEEN- Larsmn, asubject of the King of Great Britain, residing at Bisbee, in the countyof Cochise and State of Arizona, have invented a new and useful ElectricBurglar-Alarm; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to improvements in circuit closers, which areemployed to close the circuit in electric-burglar-alarm systems, andgive an alarm when some movable object, such as a window, is moved toobtain access to a room or building.

.One of the features of the invention is the provision of a latch forlocking one member of the circuit closer, to prevent the same fromoperating to close the circuit, when it is desired that the alarm shouldnot be given.

The invention comprises further features and combination of parts, ashereinafter set forth, shown in the drawings and claimed.

In the drawings :Figure 1 is a vertical sectional view, through aportion of a window frame and its window, showing the circuit closer asapplied. Fig. 2 is a transverse sectional. view. Fig. 3 is a detailview.

Referring to the drawings 1 designates the window frame having the usualguide strips 2 for guiding the window sash 3. The window frame is formedwith a recess 4, in which the member 5 is arranged. Secured to themember 5 is a plate 6, which constitutes the immovable contact member 7.A binding post 8 is carried by the plate 6 and has connected to it awire or lead 9, which extends to the usual form of bell 10, which inturn is connected by a lead 8 to the bat tery 12. The battery 12 isconnected by a lead or wire 13 to a binding post 14 of the movablecontact member 15. The movable contact member 15 is secured by means ofthe binding post 14, to the oscillatory block or plate 18, the samebeing pivoted at 1.9 in an opening 20 of the window frame. This block orplate 18 is arranged between the guides 2 for the sash, so as to beadjacent the edge portion of the window sash. To limit the outwardmovement of the lower end of the block or plate 18 a stop 21 is arSpecification of Letters Patent.

Application filed April 15, 1912.

Patented Sept. 24, 1912.

Serial No. 691,061.

ranged in its path. The object in preventing the outward movement of theblock or plate 18, is to prevent the burglar, after raising the windowsash a certain distance, to escape the upper end of the block or plate,and subsequently pull the said upper end of the block inwardly, therebypreventing the circuit from being closed. When it is desired that, thecircuit should not be closed, a latch member 24: pivoted at 25, in therecess 26 and provided with a dog 27 is supplied. The dog 27 engages anotch 28 of the block or plate 18, and holds the same in a verticalposition. However, when the latch 24 is raised, the block or plate 18oscillates a trifle, as shown in dotted lines in the drawings, so as toprevent the dog 27 from again entering the notch 28. When the windowsash is raised sufficiently, and the dog is out of engagement with thenotch, the block or plate 18 is swung on its pivot by the spring 29,thus bringing the movable contact 15 in engagement with the stationarycontact 7 thus closing the circuit, and giving the alarm.

The invention having been set forth, what is claimed as new and usefulis In a circuit closer, the combination of a window frame having arecess therein, a member secured therein and provided with a stationarycontact member, the window frame having an opening communicating withsaid recess, a block pivoted in the opening and provided with a contactmember, a spring connected to the upper end of the block at one end,with its other end secured to the window frame, and adapted to oscillatethe block to bring the two contact members together, the frame having arecess above the opening, a latch pivoted in the last named recess andprovided with a dog to engage the block, to lock the same in its normalposition with its contact members separated, and a lug constituting astop arranged at the lower portion of the opening, to limit the outwardmovement of the block.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

THOMAS WILLIAM KEENLEYSIDE.

Witnesses:

JOHN VVALLAOE DICKINSON, WILLIAM MARTIN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

